Decoupling and antiresonance in electronic transport through a quantum dot chain embodied in an Aharonov-Bohm interferometer - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Electronic transport through a quantum dot chain embodied in an Aharonov-Bohminterferometer is theoretically investigated. In such a system, it is foundthat only for the configurations with the same-numbered quantum dotsside-coupled to the quantum dots in the arms of the interferometer, somemolecular states of the quantum dot chain decouple from the leads. Namely, inthe absence of magnetic flux all odd molecular states decouple from the leads,but all even molecular states decouple from the leads when an appropriatemagnetic flux is introduced. Interestingly, the antiresonance position in theelectron transport spectrum is independent of the change of the decoupledmolecular states. In addition, when considering the many-body effect within thesecond-order approximation, we show that the emergence of decoupling gives riseto the apparent destruction of electron-hole symmetry. By adjusting themagnetic flux through either subring, some molecular states decouple from onelead but still couple to the other, and then some new antiresonances occur.

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